Codes and Frequencies
Description
LUNGWORKYRC indicates whether the person had chronic work-related respiratory condition in the past year. This variable is created with supplemental programming by the IPUMS NHIS staff from the pre-1997 condition records. For general information about IHIS variables (such as LUNGWORKYRC) created from the pre-1997 condition records, see the User Note on Condition Records and Condition Variables.
Defining Work-Related Respiratory Condition Records and Identifying Persons with Work-Related Respiratory Conditions
For all available years, persons who were asked a direct question about work-related respiratory conditions and who have such a condition record are given a "Yes" code for LUNGWORKYRC. Persons who were asked a direct question about work-related respiratory conditions but do not have a chronic work-related respiratory condition record are given a code of "No." Persons who were not asked a direct question about work-related respiratory conditions, or for whom it is unknown whether they were asked such a question, are given a code of "NIU" (not in universe), regardless of whether they have a chronic work-related respiratory condition record.
For 1970 and 1978, work-related respiratory condition records were defined as those condition records with a code of "5150" through "5159" ("Pneumoconiosis due to silica and silicates" or "Other pneumoconiosis and related diseases") in the variable DCICDCOD in the original NHIS public use files. These condition code values come from the International Classification of Diseases (ICD) codes, Revision 8. Additionally, to be considered "chronic," work-related respiratory condition records must have a code of "1" ("Chronic") in the variable CACODE in the original NHIS public use files.
For 1979 to 1996, work-related respiratory condition records were defined as those condition records with a code of "5000" through "5089" ("Pneumoconioses and other lung diseases due to external agents") in the variable DCICDCOD in the original NHIS public use files. These condition code values come from the International Classification of Diseases (ICD) codes, Revision 9. As with earlier years, to be considered "chronic," work-related respiratory condition records must have a code of "1" ("Chronic") in the variable CACODE in the original NHIS public use files.
Comparability
As with all of the person-level condition variables created by IHIS from condition records prior to 1997, the universe for LUNGWORKYRC is substantially different for 1978 forward than it is for years prior to 1978. Beginning in 1978, only persons living in 1/6 of households, rather than all persons, were asked a direct question about having a work-related respiratory condition in the past year. This change requires that different weight variables be used depending on which years of data are analyzed. See the "Weights" tab for details.
Additionally, there is a change in the way "Yes" responses are coded over time. See the User Note on Condition Records and Condition Variables for details about the composite coding scheme employed by IHIS.
Universe
- 1970: All persons.
- 1978-1996: Persons living in 1/6 of households (who received Condition List 6).
Availability
- 1970, 1978-1996
